By sending off Cole and De Grey to join the future Army of Estremadura, on the 16th March, Wellington reduced the force about him by 7,000 men, and had no more than 38,000 left on the Ceira. The newly formed 7th Division, which was marching up from Lisbon, and would ultimately replace Cole with the main army, was at this moment only reaching Santarem; it did not come up to the front till March was at its end. For the rest of his operations against Masséna, therefore, Wellington was more than ever in a state of numerical inferiority, and forced to be cautious. But he was in a confident mood, foreseeing that the enemy could not now stop in Portugal, and must be starved into a prompt retreat over the frontier.
His conviction that the crisis was over is shown by another dispatch of the 20th March, in which he directs that the whole of the Lisbon Militia and Ordenança be dismissed to their homes, the former on furlough, the latter for good. The Militia of the lower Beira (the Castello Branco country) and of northern Estremadura were also to return to their native districts, to be sent on leave or kept under arms according as further events might determine[200]. Thus the Lines of Torres Vedras were left ungarrisoned, there being no further danger to be feared in the direction of Lisbon.
There was still much work, however, for the Militia of the North, Trant’s and Wilson’s brigades, who were brought down to the middle Mondego, and sent successively to Peña Cova, Mortagoa, and Fornos, to guard the fords and restrain the French from endeavouring to raid the north bank of the river. It was unlikely that they would make a serious attempt to cross in force into the barren country under the Serra de Alcoba, when they were in such a desperate plight for food, and would have the allied army close behind them, for the troops were to march again on the 17th. The middle Mondego, it must be remembered, was bridgeless, and in flood from the spring rains: even if Masséna had driven off Trant and Wilson, it would have taken him a long time to build a bridge (since he had no pontoons) and Wellington would have been pressing him in the rear before he had got more than a vanguard over the water. The Marshal seems never to have contemplated at this date a movement on to Coimbra or Oporto by the north bank of the Mondego, such as is suggested as possible by some of the commentators on the campaign: after the day of Condeixa a retreat eastward was always in his mind[201]. His army was too dilapidated to make the least offensive stroke. ‘I think it necessary for the interests of his Imperial majesty,’ wrote Masséna on the 19th, ‘to bring the troops back nearer to our base of operations by our fortresses [Almeida and Rodrigo], in order to let them recover a little from their fatigues and long privations, and to allow me to replace so much equipment which is now entirely lacking[202].’
On the 16th, the day after the combat of Foz do Arouce, the 2nd and 8th Corps marched before dawn, in drenching rain, and retired as far as the Alva river, where the bridge of Ponte de Murcella, repaired for a moment by Drouet when he passed it a few days before, had again been broken by Wilson’s Militia. It took all the day to repair it, and by the evening only the artillery had been sent across. The divisions of Mermet and Loison followed at a distance, leaving behind the much-tried battalions of Marchand, which Ney had once more chosen to form his rearguard. He drew them up across the road a few miles from the Ceira, expecting to be attacked once more in the morning. But to his surprise Wellington did not cross the river, and only sent a few scouts to discover the position of the Marshal. Meanwhile his engineers mended the bridge at Foz.
On the 17th, at dawn, Masséna sent the 8th Corps across the repaired bridge of Ponte de Murcella, after which it halted at Cortiça, Moita, and other villages beyond the Alva river, whose passage it was prepared to defend. But the 2nd Corps was marched up-stream to Sarzedo, the next ford, and placed there in position, with a detachment beyond the river at the town of Arganil on its south bank. The 6th Corps, following the other two, crossed the Alva at Ponte de Murcella later in the day, and joined the 8th; it left a small detachment beyond the bridge to observe the expected arrival of the Allies. Of the horsemen, Montbrun’s heavy dragoons watched the lower course of the Alva, from Ponte de Murcella to its junction with the Mondego, while Junot’s corps-cavalry was sent up the Alva eastward, to hold the fords beyond Arganil.
These dispositions seemed to indicate an intention to make a serious stand behind the Alva, where the positions are very strong. The river is a fierce mountain torrent in a deep bed, with precipitous banks, and very few fords. Wellington had fixed on this line, during the Bussaco campaign in the preceding autumn, as the position where he should await the French if they advanced by the south bank of the Mondego, and had thrown up earthworks on each side of the Ponte de Murcella. These were, of course, useless to Masséna, since they looked the wrong way; but the river line was almost as defensible from the north bank as from the south, and presented a very formidable obstacle to the pursuing enemy.
By the evening of the 17th Wellington was once more in touch with the enemy. The cavalry brigades of Slade and Arentschildt had crossed the bridge of Foz do Arouce, and followed the 6th Corps to the Alva, with the 6th and Light Divisions behind them. The infantry, however, did not show themselves, but encamped in the hills, some miles from the Ponte de Murcella. They found the road strewn with dead or dying mules and horses, and took a certain number of French sick and stragglers.
But Wellington had no intention of forcing the Ponte de Murcella position; while two divisions took this road, the rest of the army (1st, 3rd, 5th Divisions, and the Portuguese independent brigades) were marched eastward by the steep road along the top of the watershed between the Ceira and the Alva, the route Furcado-Arganil, towards the fords of the upper Alva. They drove out of the last-named place Reynier’s observing detachment, which reported that it had seen the Allies in great force marching up-stream. This news convinced Masséna that his adversary was intending either to cross the ford of Sarzedo and attack Reynier, or to move still further up the valley, and to pass the Alva in its upper course, so throwing himself across the main road to Celorico, by which the Army of Portugal was intending to retreat. Nothing but cavalry scouts having been seen opposite the Ponte de Murcella, it was supposed that Wellington’s whole army was marching on Arganil.
Accordingly, on the afternoon of the 17th, Masséna ordered the 8th Corps to break up hastily from its camps and to march all night to Galliges, on the high road beyond Reynier’s left. This was done, and Junot hurried off, leaving hundreds of foragers scattered on the slopes towards the Mondego, whither they had been sent out in search of food during the day. Ney remained behind at the Ponte de Murcella, to keep the passage as long as possible; he was uncertain, as was Masséna, whether there was in his front only a cavalry screen or a serious force of all arms.
On the morning of the 18th this problem was solved, for the Light Division came down to the river, drove Ney’s rearguard across it, and opened a cannonade against the troops of the 6th Corps visible on the opposite bank. No serious attempt was made to pass, the intention being only to hold Ney to his ground as long as possible by demonstrations, while the real crossing was made far up-stream. This plan had the desired result. In the afternoon Ney received the news that the Allies had begun to cross the Alva at the ford of Pombeiro, from which they had driven off one of Reynier’s battalions. If any considerable force got over the river at this point, the 6th Corps was cut off from the rest of the army; accordingly the Marshal ordered his three divisions to march off without a moment’s delay; ‘I never saw Johnny go off in such confusion,’ says a Light Division diarist[203]. The cavalry brigade of Arentschildt sent out reconnoitring parties, who forded the river, while the engineers rigged up a temporary wooden bridge close to the Ponte de Murcella[204], by which the 6th and Light Divisions were able to cross at dawn on the following day.